<span style=" font-size:10pt;font-family:sans-serif">> </span><tt><span style=" font-size:10pt">However,
I am not able to reproduce this problem.</span></tt>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Hi Sebastian.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Look at the reply
I sent this morning to the mailing list - I uploaded the code in a GitHub
repository and provided instructions in the mailing list with the exact
invocations that reproduce the issue. </span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Hope this helps!</span>
<br><span style=" font-size:10pt;font-family:sans-serif">Thanassis.</span>
<br>
<br><span style=" font-size:10pt;color:#000080;font-family:sans-serif"><b>Thanassis
Tsiodras</b></span>
<br><span style=" font-size:10pt;font-family:sans-serif">Real-time Embedded
Software Engineer </span>
<br><span style=" font-size:10pt;font-family:sans-serif">System, Software
and Technology Department</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif"><b>ESTEC</b></span>
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The Netherlands</span>
<br><span style=" font-size:10pt;font-family:sans-serif">Thanassis.Tsiodras@esa.int
| </span><a href=www.esa.int><span style=" font-size:10pt;color:blue;font-family:sans-serif">www.esa.int</span></a>
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<br>
<br>
<br>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style=" font-size:9pt;font-family:sans-serif">Sebastian
Huber <sebastian.huber@embedded-brains.de></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style=" font-size:9pt;font-family:sans-serif">Thanassis
Tsiodras <Thanassis.Tsiodras@esa.int></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Cc:
</span><span style=" font-size:9pt;font-family:sans-serif">devel
<devel@rtems.org></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style=" font-size:9pt;font-family:sans-serif">28/02/2018
12:11</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">Re:
N2X, GR740 and coverage: The impact of a linkcmds patch from 2014 to gcov_init
calls</span>
<br>
<hr noshade>
<br>
<br>
<br><tt><span style=" font-size:10pt">----- Am 27. Feb 2018 um 17:30 schrieb
Thanassis Tsiodras Thanassis.Tsiodras@esa.int:<br>
<br>
[...]<br>
> After quite a lot of hunting, we traced this failure to a patch in
the<br>
> "linkcmds.base" - done back in 2014 ( commit 95cb09ed746
) :<br>
> <br>
> This commit changed "c/src/lib/libbsp/sparc/shared/startup/linkcmds.base"<br>
> from this:<br>
> <br>
> KEEP (*(SORT(.ctors.*)))<br>
> KEEP (*(.ctors))<br>
> KEEP (*crtbegin.o(.dtors))<br>
> KEEP (*crtbegin?.o(.dtors))<br>
> KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))<br>
> KEEP (*(SORT(.dtors.*)))<br>
> KEEP (*(.dtors))<br>
> <br>
> ...to this:<br>
> <br>
> KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))<br>
> KEEP (*(SORT(.ctors*)))<br>
> KEEP (*crtbegin.o(.dtors))<br>
> KEEP (*crtbegin?.o(.dtors))<br>
> KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))<br>
> KEEP (*(SORT(.dtors*)))<br>
> <br>
> Reverting this change, the gcov stubs revert back to their proper
place,<br>
> and __gcov_inits are called properly.<br>
> <br>
> The reason I tried this patch, was because I noticed that the coverage<br>
> stubs are no longer placed in ".ctor" sections - they are
instead placed<br>
> by the newer compilers at ".ctor.NUMBER" sections (with
NUMBER set to<br>
> 65435 in my case - but I am guessing this will change from invocation
to<br>
> invocation).<br>
> <br>
> The comment provided by Joel back in 2014, only indicated that this
patch<br>
> was done to address C++ concerns:<br>
> <br>
> commit 95cb09ed746e7daeca2158c7ecdf0249cfcbc5c8<br>
> Author: Joel Sherrill <joel.sherrill@oarcorp.com><br>
> Date: Wed Apr 2 11:39:20 2014 -0500<br>
> <br>
> sparc/shared/.../linkcmds.base: Correct C++ support<br>
> Add KEEP() for .eh_frame*, .ctor*, and .dtor*.<br>
<br>
It could be a bug in the linker. The standard sections should be exactly
like the Binutils default:<br>
<br>
sparc-rtems5-ld --verbose | grep ctor -C 3<br>
*(.rela.data .rela.data.* .rela.gnu.linkonce.d.*)<br>
*(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*)<br>
*(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*)<br>
*(.rela.ctors)<br>
*(.rela.dtors)<br>
*(.rela.got)<br>
*(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*)<br>
--<br>
.init_array :<br>
{<br>
PROVIDE_HIDDEN (__init_array_start = .);<br>
KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))<br>
KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o
*crtend.o *crtend?.o ) .ctors))<br>
PROVIDE_HIDDEN (__init_array_end = .);<br>
}<br>
.fini_array :<br>
--<br>
KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o
*crtend.o *crtend?.o ) .dtors))<br>
PROVIDE_HIDDEN (__fini_array_end = .);<br>
}<br>
.ctors :<br>
{<br>
/* gcc uses crtbegin.o to find the start of<br>
the constructors, so we make sure it is<br>
first. Because this is a wildcard, it<br>
doesn't matter if the user does not<br>
actually link against crtbegin.o; the<br>
linker won't look for a file to match a<br>
wildcard. The wildcard also means that it<br>
doesn't matter which directory crtbegin.o<br>
is in. */<br>
KEEP (*crtbegin.o(.ctors))<br>
KEEP (*crtbegin?.o(.ctors))<br>
/* We don't want to include the .ctor section from<br>
the crtend.o file until after the sorted ctors.<br>
The .ctor section from the crtend file contains the<br>
end of ctors marker and it must be last */<br>
KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))<br>
KEEP (*(SORT(.ctors.*)))<br>
KEEP (*(.ctors))<br>
}<br>
.dtors :<br>
{<br>
<br>
However, I am not able to reproduce this problem. For example in the sptls04
linker map file (-Wl,-Map,map.txt) we have this:<br>
<br>
*crtbegin.o(.ctors)<br>
.ctors 0x0000000002011330
0x4 /opt/rtems/5/lib/gcc/sparc-rtems5/7.3.0/crtbegin.o<br>
*crtbegin?.o(.ctors)<br>
*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)<br>
.ctors 0x0000000002011334
0x4 init.o<br>
*(SORT_BY_NAME(.ctors*))<br>
.ctors 0x0000000002011338
0x4 /opt/rtems/5/lib/gcc/sparc-rtems5/7.3.0/crtend.o<br>
<br>
Who do the linker map files look in your test case?<br>
</span></tt>
<br>
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